Facile synthesis of FeSi4P4 and its Sodium Ion Storage Performance

- Pure FeSi4P4 is synthesized via a facile ball milling method.
- FeSi4P4 anode shows excellent cycling stability and rate ability for SIBs.
- Insertion/extraction reaction is revealed for FeSi4P4 electrode.

FeSi4P4 has been synthesized by a facile ball-milling method and evaluated as anode in sodium ion battery for the first time. The FeSi4P4 electrode can deliver a reversible capacity of 180 mAh g−1 at 100 mA g−1 with a capacity retention of 99% after 100 cycles. Experimental data and DFT calculation reveal that the sodium storage in FeSi4P4 is realized via the unusual insertion/extraction reaction. Our results demonstrate that transition metal phosphosilicides could be potential anode materials for sodium ion batteries.

FeSi4P4 can deliver a reversible capacity of 180 mAh g−1 at 100 mA g−1 with a capacity retention of 99% after 100 cycles. The sodium storage in FeSi4P4 is realized via the unusual insertion/extraction reaction.115